BP Solar is suffering a slow death that is hard to watch and reflects the cutthroat competition that marks an industry that used to be a lot more Pollyanna. The company is closing down and on Tuesday its joint venture partner, Tata Power, said it will buy out BP’s share in their enterprise.

The pace of solar energy development is accelerating as the installation of rooftop solar water heaters takes off. Unlike solar photovoltaic (PV) panels that convert solar radiation into electricity, these “solar thermal collectors” use the sun’s energy to heat water, space, or both.

China had an estimated 168 million square meters (1.8 billion square feet) of rooftop solar thermal collectors installed by the end of 2010 — nearly two thirds of the world total. This is equivalent to 118,000 thermal megawatts of capacity, enough to supply 112 million Chinese households with hot water. With some 5,000 Chinese companies manufacturing these devices, this relatively simple low-cost technology has leapfrogged into villages that do not yet have electricity. For as little as $200, villagers can install a rooftop solar collector and take their first hot shower. This technology is sweeping China like wildfire, already approaching market saturation in some communities. Beijing’s goal is to reach 300 million square meters of rooftop solar water heating capacity across the country by 2020, a goal it is likely to exceed.

While the passage of time makes solar cost competitive for many Americans right now, the question of cost competitiveness is not a simple one for solar. It depends on location, installation costs, and what kind of power solar is competing against. In Africa, solar has already become cheaper than kerosene in many locations. And now Renewable Energy News reports that solar is becoming cheaper than diesel generators in India as French-company Solardirect has bid to supply the energy grid with solar power at a rate cheaper than the average for diesel generators:

Home solar company SunRun has taken a look at what we can expect from the solar industry in 2012. According to SunRun, adoption among mainstream consumers will grow as solar prices continue to drop. At the same time, the industry will see significant consolidation and enduring leaders will emerge. Here is a list of SunRun’s predictions:

Apple has updated their plans that describe their future headquarters yesterday. The updated Spaceship campus is now planned to include solar panels on its roof, and as ugly as it may have looked through the eyes of Steve Jobs, maybe, the idea is not bad – after all it will generate around 5 megawatts of clean electricity to power the factory where grown-up toys are made.

The Spaceship’s rooftop has been estimated to have around 750,000 square feet. 9to5mac.com, a website specialized in Apple news calculated that about 500,000 sq ft will be used for solar power. Assuming that an average solar panel produces around 10 watts per square foot, that gives the 5 megawatt figure.

Recently the Cleantech Group, with the assistance of an advisory panel of corporate executives, sat down to decide upon the third annual Global Cleantech 100: the hundred “most promising and innovative” clean technology companies of 2011. The listed companies span a range of industries, and though solar energy firms, chemical recyclers, LED manufacturers and energy-monitoring software programmers certainly aren’t under-represented, many companies in the hundred are defined by a single product or idea. Gizmag scoured the Cleantech 100 to find what we thought were the ten most innovative companies.

Google has abandoned its effort to come up with better flat mirrors and power plant designs for producing electricity from the sun’s heat, but it is releasing its research results so that others could perhaps use it to create commercially viable solutions.

Google Makes a Mistake

As you can see from the linked stories on the left of this article, Google is quite a big proponent of renewable energy. They have made all kinds of investments in wind, solar, geothermal, etc. Some are to generate clean energy for their own needs, others are more akin to financing deals to help big wind and solar farms get built. In any case, it is very commendable work and if more big corporations had the long-term vision of Google, the world would definitely be in better shape.

Europe’s ambitious project to capture solar and wind energy across Arab deserts to power homes in Europe, the Middle East and Africa inched forward Thursday despite technical and political hurdles.

Two international consortiums led by German and French industrial giants joined forces in highly complex drives to deploy solar panels and wind turbines in arid regions, and sink cables across the Mediterranean.

The two groups, Desertec Industry Initiative and Medgrid, signed a cooperation deal in Brussels on the sidelines of an EU energy ministers’ meeting, linking projects aimed at meeting 15 percent of Europe’s electricity demand by 2050.

Google Inc has abandoned an ambitious project to make renewable energy cheaper than coal, the latest target of Chief Executive Larry Page’s moves to focus the Internet giant on fewer efforts.

Google said on Tuesday that it was pulling the plug on seven projects, including Renewable Energy Cheaper than Coal as well as a Wikipedia-like online encyclopedia service known as Knol.

The plans, which Google announced on its corporate blog, represent the third so-called “spring cleaning” announcement that Google has made since Google co-founder Page took the reins in April.

Would tariffs placed on Chinese solar panels amount to “protectionism?” Are the companies most critical of the trade complaint “just crying foul?” And what’s more important to American companies, the race to grid parity or the desire to reclaim solar manufacturing from China?